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J Exp Biol (2022) 225 (7): jeb243047.
Published: 19 April 2022
...James C. Mouton; Renée A. Duckworth; Ryan T. Paitz; Thomas E. Martin ABSTRACT Maternal hormones can shape offspring development and increase survival when predation risk is elevated. In songbirds, yolk androgens influence offspring growth and begging behaviors, which can help mitigate offspring...
Includes: Supplementary data
J Exp Biol (2013) 216 (13): 2403–2411.
Published: 1 July 2013
..., melanocortins and androgens, underlie the short-term and long-term modulation of signal amplitude and duration observed during social interaction. Population density drives signal amplitude enhancement, unexpectedly improving the reliability with which the signal predicts the signaler's size. The signal's...
J Exp Biol (2011) 214 (16): 2761–2767.
Published: 15 August 2011
... to minimize such costs. Taking these limitations into account, we feel our results clearly demonstrate that the role of androgens in preparing for breeding has been co-opted to facilitate the migratory events needed to reach breeding areas. Males with elevated testosterone early on during migratory...
J Exp Biol (2009) 212 (19): 3108–3118.
Published: 1 October 2009
... also significantly altered androgen and corticosterone profiles of snakes,providing a potential mechanism to explain reported annual variation in steroid hormones. Although previous studies indicate that male red-sided garter snakes exhibit a dissociated reproductive strategy, we demonstrate...
J Exp Biol (2005) 208 (7): 1287–1295.
Published: 1 April 2005
...Pierre Deviche; Luis Cortez SUMMARY The immunocompetence handicap (ICH) hypothesis predicts that elevated levels of the gonadal androgen testosterone (T) entail obligatory costs, such as immunosuppression, but evidence supporting this immunosuppressive influence is equivocal. To investigate...
J Exp Biol (2004) 207 (12): 2083–2093.
Published: 15 May 2004
... that physiological concentrations of androgens, 17β-estradiol and cortisol rapidly (<10 min) enhance inotropism (30–40%) in a sex-specific manner. These effects were specific to the hormones studied, absent if animals were anesthetized chemically and dependent upon steroid concentration and contraction frequency...
J Exp Biol (2003) 206 (19): 3467–3477.
Published: 1 October 2003
... and fatigue resistance for the production of long mating calls. Type II (floater) males show characteristics that are intermediate, but statistically not significantly different, between type I males and females. Six weeks after castration and androgen (testosterone and 11-ketotestosterone) replacement...